If they ever had housing(or guild halls) I would like them to be in their own instance/zone. I remember what the world in UO looked like with people placing tents/houses/towers/castles everywhere there wasn't trees. It got cluttered quite quickly... Getting into people's houses and taking everything that wasn't locked down was pretty funny though..

Now, if we had what GW1 (not sure about GW2) had, a Guild Hall, I'd go for a recreated Camp Taurjo, maybe a small village like thing on The Lost Isle, or Kazan, if the volcano didn't go kaboom ( I'M LOOKING AT YOU, DEATHWING! D:< )

Shattrath, I'd find somewhere quiet in the lower city and hang out there.

It's perfect. I'm not stuck in a uselessly remote place where I would almost certainly die trying to get anywhere, it's not Dalaran, which is clearly way too dense, it's fairly quiet, pretty, large, has many types of vendors for the things I need daily, and I could hang out talking about the old days, go drinking; no doubt annoying Haris Pilton.

It's also a sanctuary, so nobody can attack me, but I can meet all types of players. No contest for me, really. There are plenty of pretty places in the game, but I'd be worried about being killed by some shitty mob.